This is the bottle that put Nalgene on the map. Constructed of tough, transparent Lexan polycarbonate, these wide-mouth bottles are incredibly impact resistant, even in extreme cold and heat. Transparent smoke-grey 32-ounce bottle with permanently attached black top. Store food, water, gear- nearly anything. Leakproof bottle is guaranteed for life. Graduations help you keep track of your fluid intake or serve as a useful guideline when mixing up a beverage in your Nalgene.